题目内容
3．Some scientists think that it will take __ of years to make robots do most work for humans．（ ）| A． | hundreds | B． | hundred | C． | thousand |
分析 一些科学家认为需要数百年的时间才能让机器人为人类做大部分工作．
解答 答案：A 数词分为确数和约数．确数的结构为：数字+hundred/thousand/million/billion的单数形式；约数的结构是：hundred/thousand/million/billion的复数形式+of．此题中_____of，表明用约数，故选A
点评 先确定使用确数还是约数，然后再分析两个数的结构，联系本题目所需要的一种解答．
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